JPH0660520A - Disk reproducing device - Google Patents

Abstract

PURPOSE:To selectively reproduce plural disks and to miniaturize the device by operating the rotation of a rotary tray and its vertical movement and the movement of a clamper in synchronization with them in relation to each other by using one cam gear. CONSTITUTION:One of three disks placed on the rotary tray 21 at the same angular intervals is selected in rotating 120 deg. by rotating a gear 30 interlocked with the rotation of the cam gear 38, standing face to face with an upper part than a reproducing unit 23. Subsequently, the disk is lowered to the position of the unit 23 by operating a cam wall 32 of the gear 28, and is clamped on a turntable 12 by a clamper, so as to be reproduced by an optical head. When a reproducing mode is canceled, the tray 21 and the clamper are lifted, and the next disk is selected to be ready for setting the next reproducing mode. Consequently, the compact device with a simple driving control can thus be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc reproducing apparatus for mounting a plurality of discs at equiangular intervals around a rotary shaft, and particularly to downsizing thereof.

[0002]

2. Description of the Related Art Recently, a disc reproducing apparatus for optically reproducing information recorded on a disc recording medium has become widespread. In particular, the spread of a disc reproducing apparatus for reproducing music information recorded on a disc recording medium having a diameter of 12 cm or 8 cm, that is, a so-called CD (compact disc) is remarkable. This type of disc reproducing apparatus is typically of a type in which one CD is loaded for playback, and one of which is a magazine (disc cartridge) in which a plurality of CDs are loaded in advance. There are some types that are selected for reproduction.

In recent years, a rotating tray has been used in which three CDs are placed side by side at equal angular intervals around a rotating shaft, and the rotating trays are controlled to rotate by 120 °, so that the CDs placed on the rotating tray are rotated. A so-called carousel type disc reproducing apparatus which is alternatively used for reproducing has also been developed.

The disk reproducing apparatus using the rotary tray of this type has an advantage that its structure is relatively simple. However, on the other hand, the rotating tray needs to have a size (diameter) on which three CDs are placed side by side in a plane, and the overall size as a disk reproducing device, especially the width, cannot be denied. . Moreover, if four or more CDs are to be accommodated, the diameter of the rotary tray will increase dramatically each time the number of accommodated CDs is increased, making it difficult to put into practical use.

[0005]

As described above, in the conventional disc reproducing apparatus using the rotary tray, the rotary tray has a large diameter, and the width of the disc reproducing apparatus correspondingly increases. Therefore, there was a problem in making it compact.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a highly practical disk reproducing apparatus in which the width of the disk reproducing apparatus is kept small and the size thereof is made compact. It is in.

[0007]

DISCLOSURE OF THE INVENTION A disc reproducing apparatus according to the present invention rotatably comprises a rotary tray having a plurality of disc mounting portions for mounting a plurality of discs at equal angular intervals around a rotation axis. Further, it is supported so as to be movable up and down, and the rotary tray is rotated at a predetermined position by a predetermined angle to selectively face the disc mounting portion above the reproducing unit. Along with lowering to the table position, interlocking with the lowering of the rotary tray, the clamper that holds the disc between it and the turntable of the playback unit is retracted to open the upper part of the disc mounting part to enable disc exchange. The position is moved from the position to the clamp position above the central portion of the disk mounting portion.

In particular, the rotation of the rotary tray and the vertical movement thereof,
Further, the movement of the clamper is synchronized with each other by using one cam gear to perform a synchronous operation.

[0009]

According to the disc reproducing apparatus having such a structure,
The rotation of the rotary tray, its vertical movement, and the movement of the clamper can be linked to each other only by controlling the rotation of the cam gear, so that multiple discs on the rotary tray can be selectively played by simple control. Can be offered. Moreover, when the carousel is in the raised position, the clamper is moved to the retracted position and the upper part of the disc loading part is open so that the disc can be exchanged. Therefore, the disc can be easily attached to and detached from the carousel without being disturbed by the clamper. Can be done.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A disk reproducing apparatus according to an embodiment of the present invention will be described below with reference to the drawings. First, a rotary tray for mounting a disc used in the apparatus of this embodiment will be described. The rotary tray is rotatably incorporated into the disc reproducing apparatus main body by a predetermined angle, and a plurality of discs (here, compact discs; CDs) mounted around the rotation axis are turned into a turntable mechanism, an optical head mechanism, or the like. The recording unit is selectively opposed to the reproducing unit consisting of and is used for optical reproduction of the recorded information.

FIG. 1 (a) shows a plan configuration of a rotary tray for placing a disk according to this embodiment, and FIG. 1 (b).
1 schematically shows the cross-sectional structure of the portion shown by the one-dot chain line A in FIG. The carousel shown in this embodiment has three CDs each having a diameter of 12 cm, and is provided with a rotary shaft 1a at the center of the lower surface of a disk-shaped tray body 1 made of a synthetic resin material. There is. Then, on the top surface of the tray body 1, 3
Three disk mounting parts for mounting each CD
The circular recesses 2, 3 and 4 are formed around the rotary shaft 1a at equal angular intervals (120 ° intervals in this example).

Each of the disk mounting portions 2, 3 and 4 is a circular recess having an inner diameter W, and the height of the bottom surface inside the recess is
The (depth) is sequentially changed. In particular, these disk mounting portions 2, 3, 4 avoid the circular holes 2a, 3a, 4a for inserting turntables formed respectively at the central positions of the mounting areas so that the respective storage areas partially overlap each other. The circular concave portions are continuously formed with a step.

With respect to the inner diameter W of each circular recess, the outer dimension of the CD is defined as D, and the allowable center deviation of the disc clamp by the turntable (the allowable amount of positional deviation of the CD relative to the turntable that can reliably clamp the CD). It is set as (D + d) when) d is considered to be a margin for mounting the disc.

As shown in FIG. 2, the step H between the inner bottom surfaces of the circular recesses is such that the thickness of the CD 11 is T, and the circular hole 2
The turntable 12 that inserts a, 3a, 4a is the disk mounting part
The height dimension for lifting the CD 11 on 2, 3, 4 is t1, and at this time, in order to maintain a non-contact relationship with another CD 13 which is placed on the upper disc placing portion and is located above. The gap dimension is t
If the value is 2, then (T + t1
+ T2).

Therefore, the three disc mounting portions 2, 3, 4 have a step H (= T + t1 +) from the disc mounting portion 2 located in the upper stage.
At t2), a circular recess is formed deeply and the middle disk mounting part is formed.
3 and the step H (=
By forming a circular recess deeply by (T + t1 + t2), it is formed as the lower disk mounting portion 4. At this time, the depth of the circular concave portion forming the upper disk mounting portion 2 may be set to the step size H, but since the CD is not provided above it, basically the disk mounting portion 2 is not provided.
As the depth of the circular recessed portion, it is sufficient if the height of the CD is about t1. In addition, in FIG.
A clamper 4 holds the CD 11 between the turntable 12 and the turntable 12.

In this way, by forming a step and avoiding the circular holes 2a, 3a, 4a, the storage areas are partially overlapped to form a continuous circular recess, so that a circular recess is formed around the rotary shaft 1a. According to the carousel in which the three disk mounting portions 2, 3, 4 are provided at equal angular intervals, the CDs are sequentially mounted from the lower disk mounting portion 4 to the middle and upper disk mounting portions 3, 2. By doing so, as shown in FIG. 3, these three CDs 7,8,9 are
Rotating clamped parts 7a, 8a, 9 at the center of the disk of each CD 7, 8, 9
It will be stored on the carousel in a partially overlapping state, avoiding each a.

Then, the rotary tray 1 is centered around the rotary shaft 1a.
When rotated by 20 °, one of the disc mounting parts 2, 3 and 4 is moved to the position of the reproducing unit in order, and the CDs 7, 8 and 9 mounted thereon are selected as the reproducing unit. They are arranged to face each other. In this state, for example, if the playback unit is raised to the rotary tray side by a predetermined height, or if the rotary tray is lowered to the playback unit side by a predetermined amount, the disc mounting portion 2 at the position facing the playback unit, The CDs 7, 8 and 9 placed on the disks 3 and 4 are lifted by the above-mentioned height dimension t1 by the turntable which passes through the circular holes 2a, 3a and 4a and enters from below the rotary tray. And CD 7,8,9
Is clamped between a clamper (not shown) located above it and the turntable 12, and is rotationally driven for information reproduction by the optical head.

Here, the rotary tray and the turntable 12 are provided.
The relative amount of movement of the turntable 12 through the circular holes 2a, 3a, 4a into the upper surface of the rotary tray by the relative movement in the height direction with respect to the disc mounting unit facing the reproducing unit. It goes without saying that it is determined according to the depth of the bottom surface of the recesses of the mounting portions 2, 3, and 4. Specifically, as compared with the case where the lower disk mounting portion 4 faces the reproducing unit, when the middle disk mounting portion 3 faces, the turntable moves extra by the step H. When the upper disk mounting portion 2 faces each other, the turntable is further moved by the amount of the step H, that is, 2H. As a result, each disk mounting portion 2,
The CDs 7, 8 and 9 placed on the disks 3 and 4, respectively, are lifted from the bottom surface of the concave portion by a height t1 and used for reproduction.

The circular holes 2a, 3a, 4a described above are used for the respective CDs 7,
It goes without saying that holes corresponding to the rotating clamped portions 7a, 8a, 9a of 8, 9 are provided as holes having a diameter through which the turntable can be inserted. Also, the optical head is used for each disk mounting part.
Each of the disk mounting portions 2, 3, through the groove holes 2b, 3b, 4b formed from the circular holes 2a, 3a, 4a of 2, 3, 4 toward the outer peripheral side of the tray.
It is designed to be exposed to CDs 7, 8 and 9 placed on 4.

The shape of these groove holes 2b, 3b, 4b and the formation positions in the disk mounting portions 2, 3, 4 are the shape and structure of the optical head mechanism in the reproducing unit, the mounting position of the reproducing unit to the rotary tray, etc. Needless to say, it is determined according to the specifications of. For example, the circular holes 2a, 3a, 4a for inserting the turntable and the groove holes 2b, 3b, 4b for exposing the optical head to the disk may be formed as one continuous long hole.

By the way, at the portion of the inner peripheral surface of the recess of the upper disk mounting portion 2 which is in contact with the inner peripheral surface of the recess of the other disk mounting portions 3 and 4, as shown in FIG. From the to the bottom surface thereof, a protrusion that protrudes inward by forming an inwardly inclined surface is formed as the disc retaining protrusion 5.

The amount of protrusion of the end portion of the disk slip-out preventing projection 5 is determined, for example, as the aforementioned marginal dimension d which defines the inner diameter W of the circular recess forming the disk mounting portion 2 in relation to the disk diameter D. ing. The height h of the end portion of the disc retaining protrusion 5 from the bottom surface inside the recess is set slightly lower than this height because the lifting height of the CDs 7, 8 and 9 by the turntable is t1 as described above. To be done.

However, such a disc retaining protrusion
The numeral 5 prevents the CD 7 from laterally slipping off from the disc mounting portion 2. That is, in the rotary tray on which the three disks are partially overlapped and mounted as described above, the inner peripheral surface of the recess of the disk mounting portion 2 is adjacent to this as shown in FIG. Other disk mounts 3 and 4 to be formed
It is greatly scraped by. As a result, the opening width P of the inner peripheral surface of the recess of the upper disc mounting portion 2 may exceed the disc diameter D depending on the above-mentioned inner diameter allowance d and the overlapping amount of the mounting regions. In this case, the CD 7 on the disc mounting portion 2 slides laterally through this opening,
There is a risk of slipping down to the other disc mounting portions 3 and 4.

However, even in such a case, according to the above-mentioned disk slip-out preventing projection 5, the opening width can be narrowed by the amount of the inward projection and can be made smaller than the disk diameter D. It is possible to effectively prevent the CD 7 from slipping off. Moreover, the height of the disc retaining protrusion 5 is the height t of the CD 7 lifted by the turntable.
Since it is kept lower than 1, C on the turntable
When the D7 is clamped and rotated, the disk retaining protrusion 5 does not get in the way.

Although the above-described embodiment is premised on mounting only a CD having a diameter of 12 cm, a C having a diameter of 8 cm is used.
It is also possible to configure so that D can be placed. In this case, as shown in FIG. 6, circular recesses 2c, 3c and 4c for 8 cm diameter CD may be formed coaxially on the inner bottom surfaces of the respective disk mounting portions 2, 3 and 4. These circular recesses 2c, 3c,
The depth of 4c from the inner bottom surface of the recess of each of the disk mounting portions 2, 3 and 4 may be such that it is shallow enough to regulate the displacement of a CD having a diameter of 8 cm. When the depth of the circular recesses 2c, 3c, 4c is set to t3, the above-mentioned disc mounting portions 2,
The step H between 3 and 4 may be set as (T + t1 + t2 + t3).

In this case, the same disk disengagement projection 5 as the disk disengagement projection 5 described above is also provided on the inner peripheral surface of the circular recess 2c adjacent to the inner peripheral surfaces of the other disk mounting portions 3 and 4. It goes without saying that 6 should be formed.

Now, the disk reproducing apparatus according to this embodiment using the rotary tray having the above-described shape is schematically configured as shown in FIG.

A plurality of disc mounting portions 2, 3, 4 are mounted on the tray body 1.
The rotary tray 21 formed by forming the same at equal angular intervals is rotatably and vertically movable at a substantially central position on a chassis 22 which is a main body of the apparatus. Further, a portion of the lower surface of the chassis 22 facing the disk mounting portions 2, 3, 4 of the rotary tray 21.
In the example (upper side in FIG. 7 in this example), there is a reproducing unit 23 having a turntable mechanism and an optical head mechanism, and the turntable has circular holes 2a, 3a, 4 of the disk mounting portions 2, 3, 4 respectively.
The optical head is fixedly provided so as to face a and be positioned so as to be movable along the slots 2b, 3b, 4b. In other words, the rotary tray 21 is rotatably and vertically movable at a position where the disk mounting portions 2, 3, 4 alternately face the reproducing unit 23 due to the rotation thereof.

Then, the chassis 22 has a rotary tray.
A clamper support 25 is provided on the side of 21 and has its base rotatably and vertically movable. This clamper support 25 is a turntable for the playback unit 23.
A clamper 24 for sandwiching the disc on the disc mounting portions 2, 3, and 4 is supported at its tip (rotating end). The rotation and vertical movement of the clamper support 25 causes the clamper 24 to be moved to the retracted position which is always on the side of the rotary tray 21 so that the clamper support 25 is located above the disk mounting portions 2a, 3a, 4a of the rotary tray 21. The disc 24 is opened so that the disc can be exchanged, and when the disc is reproduced, the clamper 24 is moved above the disc mounting portions 2a, 3a, 4a which face the reproduction unit 23 as an alternative, and between the turntable 12 of the reproduction unit 23. Thus, the operation of holding the disks on the disk mounting portions 2a, 3a, 4a is exhibited.

FIG. 8 is a plan view showing a drive system for the rotary tray 21 and the clamper support 25, and 26 is a motor as a drive source thereof. The rotational force of the motor 26 is transmitted from a small-diameter gear 26a fixed to the rotating shaft of the motor 26 to a cam gear 28 that vertically moves the rotary tray 21 and the clamper support 25 via a reduction gear 27. The rotational force transmitted from the motor 26 to the cam gear is transmitted to the gear 30 for rotating the rotary tray 21 by a predetermined angle via the toothless gear 29 integrally formed on the back surface of the cam gear 28.

This gear 30 is connected to the rotary tray 21 so as to be rotatable integrally with the rotary tray 21, and has three cam grooves 30a engaging with the ratchet mechanism 31 on its lower surface at equal intervals in the circumferential direction. Prepare for (120 ° intervals). And gear
Each time the toothed gear 30 meshes with the toothless gear 29 and is rotated through 120 °, it is positioned at the rotational position by the ratchet mechanism 31. By rotating the gear 30 by 120 °, the rotary tray 21 is rotated by 120 °, as will be described later, and the disc mounting portions 2a, 3a, 4a selectively face the reproducing unit 23. Be positioned. By the way, the cam gear 28 is shown in FIG.
As shown in 0 (a) and (b) in plan view, a first cam wall 32 having a cam surface whose position changes in the height direction is formed on the outer peripheral surface of the upper surface of the cam wall 32. Further, gear teeth 28b that mesh with the reduction gear 27 are formed. Further, inside the first cam wall 32, a second cam wall 33 having a cam surface whose position changes in the radial direction is formed.

The first cam wall 32 vertically moves the rotary tray 21 and vertically moves the clamper support 25 on the cam surface in the height direction. Also the second cam wall
Reference numeral 33 denotes a position above the center of the disk mounting portions 2, 3 and 4 which face the clamper support 25 to the reproducing unit 23, and the rotary tray 2
It is to move in the horizontal direction between the retracted position and the upper area of 1.

However, the toothless gear 29 integrally provided on the back surface side of the cam gear 28 has its area adjusted to the number of disk mounting areas (@ 3 "in this example) formed on the rotary tray 21. Gear teeth 29b that selectively mesh with the gear 30 are formed at predetermined portions of each of these regions in the circumferential direction, except for the portions where the gear teeth 29b of each region are formed. The tooth-missing gear is a toothless portion, and the tooth-missing gear 29 rotates at this tooth-missing portion without meshing with the gear 30. Further, the number of teeth of each gear tooth 29b is (1/3) of the number of teeth of the gear 30. ), When the cam gear 28 rotates 120 °,
The gear teeth 30 are selectively meshed with the gear teeth 29b and are rotated by 120 °.

On the other hand, the above-mentioned first and second cam walls 3
Reference numerals 2 and 33 respectively divide the cam surface region into three equal parts in the circumferential direction in relation to the formation position of the gear tooth 29b of the toothless gear 29, and form a cam surface of the same shape in each region.

That is, the first cam wall 32 is related to the position of the tooth-missing portion where the gear tooth 29b of the tooth-missing gear 29 is interrupted in the rotational direction of the cam gear 28 (counterclockwise direction in the drawing). A cam surface having a V-shaped groove whose upper end surface changes in the height direction is formed. The second cam wall 33 connects the two concentric circular surfaces 33a and 33b having different radii to each other in relation to the position of the tooth-missing portion where the gear tooth 29b of the tooth-missing gear 29 is interrupted. The cam surface is formed with a concave portion in the radial direction. A surface 33c of the concave portion forming the cam surface, which faces the rotation direction of the cam gear 28, is formed obliquely so that a cam pin, which will be described later, dropped in the concave portion is gradually displaced outward as the cam pin rotates.

By the first and second cam walls 32 and 33 having such cam surfaces, the cam gear 28 has a width of 120 mm.
When rotating, the rotary tray 21 is moved up and down, and in association therewith, the clamper support 25 is moved horizontally and up and down. The action of these cam surfaces on the rotary tray 21 and the clamper support 25 is performed in a state where the toothless gear 29 is out of mesh with the gear 30 as the cam gear 28 rotates.

That is, after the cam gear 28 rotationally drives the gear 30 to engage the gear 30 with the ratchet mechanism 31, the rotation of the cam gear 28 causes the rotary tray 21 to move up and down by the cam surface. The clamper support 25 is horizontally moved and vertically moved. Carousel with this cam gear 28
The rotary drive of 21 and its vertical movement, and the horizontal movement of the clamper support 25 and its vertical movement are specifically performed as follows.

As shown in FIG. 11 as a schematic sectional structure showing the relationship between the support structure of the rotary tray 21 and the clamper support 25 and the cam surface of the cam gear 28, the rotary tray 21 is provided on the lower surface of the central position thereof. The rotating shaft 1a is inserted through an upper surface plate 22a forming a part of the chassis 22, and a bottom plate 22b of the chassis 22 is inserted.
It is loosely fitted to a shaft 41 protruding from the shaft 41 and is rotatably and vertically movably supported. The gear 30 is rotatably supported on the base of the shaft 41. The rotary tray 21 has a spring bearing 42 fitted to the lower end of the rotary shaft 1a.
A pin 30a provided on the upper surface of the gear 30 is engaged with the gear 30 to rotate in association with the rotation of the gear 30. The rotary tray 21 through the spring bearing 42 and the pin 30a.
The connection structure between the gear 30 and the gear 30 is held regardless of the vertical movement position of the rotary tray 21.

However, at the center of the lower surface of the rotary tray 21 where the rotary shaft 1a is provided, a little distance from the center of rotation,
A cam pin 43 extending downward in parallel with the rotary shaft 1a is rotatably fitted in the base of the rotary shaft 1a. The tip of the cam pin 43 is brought into contact with the cam surface, which is the upper end surface of the first cam wall 32 of the cam gear and which changes in position in the height direction. The rotary tray 21 is biased downward by a compression spring 44 mounted between the spring receiver 42 fixed to the rotary shaft 1a and the top plate 22a.

Due to the biasing force of the compression spring 44 and its own weight,
The rotary tray 21 moves up and down in accordance with the change in the height direction of the cam surface of the first cam wall 32 due to the rotation of the cam gear 28. When the cam pin 43 is located in the above-mentioned V-shaped groove portion of the first cam wall 32, basically, the rotary tray 21.
Tries to descend to a height position defined by the groove bottom.

On the lower surface of the rotary tray 21, however, a height position regulating member 45 (45a) that regulates the descending height position of the rotary tray 21 in accordance with the above-mentioned three disk mounting portions 2, 3, and 4. , 45b, 45c) are provided. These height position regulating members 45a, 45b, 45c are the above-mentioned disc mounting portions 2, 3, 4
Are formed with a difference in height position corresponding to the step between the bottom surfaces of the recesses. Above height position regulating member 45a, 45b, 45c
When the rotary tray 21 descends following the cam surface of the first cam wall 32, the rotary tray 21 comes into contact with the height position reference member 46 provided on the upper surface plate 22a, and the descending height position of the rotary tray 21. Is defined by.

As a result, the rotary tray 21 has a height position defined by the height position restricting members 45a, 45b, 45c corresponding to the disk mounting portions 2, 3, 4 facing the reproducing unit 23. Is lowered to. At the lowered height position of the rotary tray 21, the turntable 14 of the reproducing unit 23 fixedly attached to the upper surface plate 22a is set to the disc mounting portions 2, 3,
It goes without saying that it is set as the position for lifting the disk mounted on the table 4 from below by the height t1.

The up-and-down movement of the rotary tray 21 by the first cam wall 32 of the cam gear 28 as described above is related to the rotation of the rotary tray 21 by 120 degrees by the gear 30. Blocked, i.e. disk rest
This is performed during a period in which the playback units 23 are selectively positioned to face the playback units 23, 23, and 23. In other words, carousel 21
Is rotated in one direction by 120 ° by the gear 30 when held in the upper position by the first cam wall 32. Then, the rotary tray 21 is alternately rotated by 120 ° and vertically moved to a height position defined by the disk mounting portions 2, 3, and 4.

On the other hand, the clamper support 25 is shown in FIG.
As shown in (a) and (b), a rotary shaft 25a projecting from a support portion inserted into the lower surface side of the rotary tray 21 is rotatably and vertically supported on the upper plate 22a. Has been done. The clamper support body 25 is constantly biased downward by the compression spring 48 interposed between the spring bearing 47 fitted to the tip of the rotary shaft 25a and the lower surface of the upper plate 22a, so that the rotary shaft 25a The tip is in contact with the cam surface of the first cam wall 32.
The contact portion of the rotating shaft 25a with the cam surface of the first cam wall 32 is exactly 120 ° with respect to the contact portion of the cam pin 43 of the rotary tray 21 with the cam surface of the first cam wall 32. It is defined as a different position. As a result, the clamper support 25
Is vertically moved in synchronization with the vertical movement of the carousel.

However, the clamper support 25 is not provided with a position restricting member for defining the descending height position as seen on the rotary tray 21, and the descending height position thereof will be described later. It is defined by the height position of the turntable 12 of the reproduction unit 23.

A cam pin 49, which is provided on the tip of the supporting portion of the clamper support 25 and projects downward, is provided so as to be able to contact the outer peripheral wall of the second cam wall 33. The clamper support 25 is rotationally biased by a spring (not shown) so that the cam pin 49 comes into pressure contact with the outer peripheral wall of the second cam wall 33.

Due to the pressure contact between the cam pin 49 and the second cam wall 33, the cam pin 49 of the clamper supporting member 25 is moved along with the change of the surfaces 33a and 33b of the second cam wall 33 due to the rotation of the cam gear 28. The clamper support 25 is displaced, whereby the clamper support 25 rotates about the rotation shaft 25a as a fulcrum. And clamper support 25
The clamper 24 attached to the tip of the is moved and displaced in the horizontal direction.

However, the area of the small diameter surface 33b of the second cam wall 33 is determined in relation to the position where the V-shaped groove portion of the first cam wall 32 is formed, and the clamper support 25 is The clamper 24 is located above the center of the disk mounting portion of the rotary tray 21 only during the period of vertical movement in the V-shaped groove portion of the first cam wall 32. Then, in the area of the large diameter surface 33b excluding the area of the small diameter surface 33b, the clamper 24 is moved to the retracted position on the side of the rotary tray 21 against the spring that biases the clamper support body 25 rotationally. The upper part of the disk mounting portion of the rotary tray 21 is opened so that the disk can be attached and detached.

First and second having the above-mentioned effects
With the cam walls 32, 33 of the clamper support 25, the clamper support 25 is first supported at the tip of the clamper 24 as the cam gear 28 rotates.
Is horizontally moved from the retracted position on the side of the rotary tray 21 to above the center of the disc playback position facing the playback unit of the rotary tray, and then simultaneously lowered in synchronization with the lowering of the rotary tray 21. . Then, the clamper 24 clamps the disc on the rotary tray 21 between the turntable 12 and the turntable 12 which lifts the disc from the disc mounting surface by a predetermined height t1 at this lowered position. Thus, the optical head is rotated and used for information reproduction by the optical head.

Thus, according to the embodiment apparatus having the above-mentioned structure, as shown in the operation diagram of FIG. 13, the rotary tray 21 rotates 120 ° with the rotation of the gear 30 which is interlocked with the rotation of the cam gear 28, and First cam wall of cam gear 28
The descending and ascending with respect to the position of the reproducing unit 23 due to the action of 32 are alternately repeated. And carousel 21
When the disk is lowered to the position of the reproducing unit 23, the disk on the disk mounting portion of the rotary tray 21 facing the reproducing unit 23 is used for reproduction by the optical head.

As a result, the rotary tray 21 is equiangularly spaced,
The three discs, which are placed with some of them stacked on top of each other, are selected by rotating the rotary tray 21 by 120 °, and the rotary tray with the playback mode setting is selected.
The descent of 21 and the clamper 24 clamps it on the turntable 12, and information is reproduced by the optical head. Then, after the rotary tray 21 and the clamper 24 are lifted in association with the cancellation of the reproduction mode, the rotary tray 21 is rotated again by 120 ° and the next disc is selected to prepare for the next reproduction mode setting. By repeating such an action alternately, the three discs on the rotary tray 21 are successively used for reproduction.

When the rotary tray 21 is rotated 120 ° and a disc is selected, the clamper 24 is moved to the side retracted position of the rotary tray until the reproduction mode is set. The upper part of the mounting part is in an open state. Therefore, in this state, the disc can be attached to and detached from the disc mounting portion, and the disc can be easily exchanged.

Further, in this embodiment, the rotary tray 21 is rotated by 120 ° in conjunction with the rotation of the cam gear 28 which is rotationally driven by the motor 26, and the rotary tray 21 is vertically moved and the clamper 24 is moved (horizontal movement). And vertical movement) are performed in synchronization with each other. Particularly, the rotation of the rotary tray 21 shall be performed only when the rotary tray 21 is held in the raised position, and the vertical movement of the rotary tray 21 and the clamper 24 completes the rotation of the rotary tray 21 by 120 °. It is designed to work only when the carousel 21 is held in its rotating position.
It is designed to be controlled and driven centrally by 28. Therefore, it is possible to perform a reliable and stable operation with a very simple configuration, and it is possible to sufficiently increase the operation reliability.

Moreover, the three equally divided regions of the cam gear 21 are effectively utilized, the rotary tray 21 is vertically moved in one region, and the clamper 24 is vertically moved in another one region. Therefore, these operation timings can be accurately specified with a very simple configuration. Furthermore, since the movement of the clamper 24 is controlled by the first and second cam walls 32, 33 formed integrally with the cam gear 28, the movement of the clamper associated with the vertical movement of the rotary tray 21 is also very smooth. can do.

In the embodiment described above, the vertical movement of the rotary tray 21 and the movement of the clamper 24 are controlled by using one cam gear 21, but they may be controlled by using separate cam gears. good.

For example, as shown in FIG. 14, another cam gear 51 that rotates in conjunction with the cam gear 28 is provided, and the cam gear 51 is set to rotate three times for one rotation of the cam gear. Then, the cam gear 51 may be configured to move and displace the clamper support 52 that supports the clamper 24.

Specifically, the cam gear 51 is constructed as shown in the schematic external perspective view in FIG.
At the cam surface in the radial direction as shown in FIG.
Is displaced and the clamper support body 52 engaged with the hook 53 is pivotally displaced in the horizontal direction. At the same time, the shaft 52a of the clamper support 52 is moved up and down on the cam surface of the cam gear 51 as shown in FIG. 14 (d) to move the clamper 24 up and down.

With such a structure, one of the rotary trays 21 is
Since the rotary tray 21 and the clamper 24 are moved up and down by one rotation operation of the cam gear 51 every time the rotation of 20 ° is performed, substantially the same operation and effect as those of the above-described embodiment are exhibited. .

The present invention is not limited to the above embodiment. In the embodiment, the rotary tray having a structure for mounting three discs has been described. However, even when two discs are mounted, or when four or more discs are mounted, it is similarly realized. can do. Further, as means for restricting the lowering position of the rotary tray, a protrusion having a predetermined length is provided on the rotary tray side, and the height for setting the lowering position of the rotary tray by contacting the protrusion on the chassis side is defined. It may be possible to get drunk by providing a plurality of different reference planes.

Further, the clamper support may be vertically rotated with respect to the disk mounting surface of the rotary tray by a manual operation to open the upper part of the disk mounting portion so that the disk can be exchanged. It is possible. In this case, the position control of the clamper by the rotation of the cam gear can be only vertical movement. In addition, the shape, dimensions, etc. of each part may be determined according to the specifications, and in short, the present invention can be variously modified and implemented without departing from the scope of the invention.

[0061]

As described above, according to the disc reproducing apparatus of the present invention, the rotation of the rotary tray, the vertical movement of the rotary tray, and the movement of the clamper are synchronously operated and rotated only by controlling the rotation of the cam gear. Since a plurality of discs on the tray can be selectively used for reproduction, the drive control thereof is simple, and the drive mechanism can be simply and reliably constructed.

Moreover, when the rotary tray is in the raised position, the clamper is moved to the retracted position and the upper part of the disc mounting portion is opened so that the disc can be exchanged. Therefore, the clamper prevents the disc from being attached to and detached from the rotary tray. Can be performed without any trouble, and the handling of the disc can be facilitated.

[Brief description of drawings]

FIG. 1 is a diagram schematically showing a configuration of a carousel according to an embodiment of the present invention.

FIG. 2 is a diagram for explaining a step between the bottom surfaces in the recess of the disk mounting portion.

FIG. 3 is a diagram showing a state in which a disc is placed on a rotary tray.

FIG. 4 is a partial perspective view schematically showing the structure of a disc retaining protrusion.

FIG. 5 is a diagram showing a relationship between an upper disc mounting portion and a disc.

FIG. 6 is a perspective view showing another configuration example of the rotary tray.

FIG. 7 is a plan view showing a schematic configuration of an embodiment apparatus.

FIG. 8 is a diagram schematically showing a rotation transmission system of the embodiment apparatus.

FIG. 9 is a perspective view showing a schematic configuration of a cam gear.

FIG. 10 is a diagram showing the features of a cam gear and its plane configuration.

FIG. 11 is a diagram showing a support structure of a rotary tray.

FIG. 12 is a diagram showing a relationship between a clamper support structure and a cam gear.

FIG. 13 is a diagram showing an operation diagram of the embodiment apparatus.

FIG. 14 is a diagram showing another example of the support structure of the clamper.

[Explanation of symbols]

1 ... Tray body, 1a ... Rotary shaft, 2,3,4 ... Disc mounting part,
2a, 3a, 4a ... Circular hole, 2b, 3b, 4b ... Groove hole, 5, 6 ... Disc retaining protrusion, 7, 8, 9, 11 ... CD (disc), 7a, 8a, 9a ... Clamp for rotation Part, 12 ... Turntable, 14 ... Clamper, 21
… Carousel, 22… Chassis, 23… Playback unit, 24…
Clamper, 25 ... Clamper support, 26 ... Motor, 28 ... Cam gear, 29 ... Missing gear, 30 ... Gear, 31 ... Ratchet mechanism,
32 ... 1st cam wall, 33 ... 2nd cam wall, 41 ... Rotating shaft, 42
… Spring receiver, 43… Cam pin, 44… Compression spring, 45… Projection
(Height position regulating member), 46 ... Projection, 25a ... Rotating shaft, 47 ... Spring receiver, 48 ... Compression spring, 49 ... Cam pin, 51 ... Cam gear,
52 ... clamper support, 53 ... hook member.

Claims (7)

[Claims] 1. A reproducing unit provided with an optical reading unit, and a plurality of disc mounting units for mounting a plurality of discs at equal angular intervals around a rotation axis, wherein the reproducing unit is provided. The rotary tray that is rotatably and vertically movable and the rotary tray that is held at the upper rotation position are rotated by a predetermined angle to selectively oppose the disk mounting portion to the playback unit, and this rotation is performed. The tray moving mechanism for moving the tray up and down between the turntable position of the reproducing unit and the multiplicative rotation position, and the disc on the rotating tray lowered to the turntable position between the turntable of the reproducing unit. And a clamper position for clamping the disc between the turntable and the turntable in relation to the vertical movement of the rotary tray. And a clamper moving mechanism for moving the upper part of the disk mounting portion to a retracted position where the disk is exchangeably opened. 2. A plurality of disc mounting portions of the rotary tray comprises a plurality of recesses formed continuously by giving a predetermined step to the tray body, and at least the step between the inner bottom surfaces of the recess is It is set as the height of the disc plus a certain allowance, and the tray moving mechanism uses the rotary tray to a height position corresponding to the depth of the bottom surface of the concave portion of the disc mounting portion facing the reproducing unit. 2. The disc reproducing apparatus according to claim 1, wherein the disc is lowered. 3. The tray moving mechanism moves the rotary tray up and down by the rotation of a cylindrical cam having a cam surface formed in the height direction, and holds the rotary tray in the raised position when the rotary tray rotates. 2. The disc reproducing apparatus according to claim 1, wherein the rotary tray is lowered when the reproducing mode is set, and the rotary tray is raised from the lowered position when the reproducing mode is released. 4. The tray moving mechanism includes a mechanism for lowering the rotary tray to a height corresponding to the depth of the bottom surface of the recess of the disk mounting portion, the mechanism including a protruding piece provided on the lower surface of the rotary tray. The height reference member is provided on the main body of the apparatus and abuts against the protruding piece to define the descending height position of the rotary tray. One of the protruding piece and the height reference member is a recess depth of each disk mounting portion. 3. The disc reproducing apparatus according to claim 2, wherein a plurality of the protrusions and the height reference member are selectively brought into contact with the other of the protrusions and the height reference member. 5. The clamper moving mechanism includes a cylindrical cam having a cam surface formed in the height direction, and a cam gear having a cam surface formed in the radial direction integrally with the cylindrical cam, and the radius changes as the cam gear rotates. The clamper is moved horizontally between the central portion of the disk mounting portion and the retracted position on the cam surface in the direction, and the clamper at the central portion of the disk mounting portion is moved up and down on the cam surface in the height direction. The disc reproducing apparatus according to claim 1, wherein 6. The disk reproducing apparatus according to claim 1, wherein the tray moving mechanism and the clamper moving mechanism operate in synchronization by sharing a cylindrical cam having a cam surface formed in the height direction. 7. A tray moving mechanism is integrally provided with a cam gear having a cam surface, a toothless gear which selectively meshes with a gear which rotates integrally with a rotary tray to rotate the gear by a predetermined angle. The disc reproducing apparatus according to claim 3, wherein: